This is a British Guiana Block of 4 of the SG 162 & 164 1 Cent Magenta Stamps.  These were issued in 1881.

This block is from the 5th Printing, featuring positions 9, 10, 11, and 12 of the 2nd Setting.  These have full lower and right margins.  It's RARE to see this Mint and in multiples.

This beautiful block is Mint/Unused and in GEM Condition.

You have the option to have it shipped via regular or Priority Mail in the US, and Registered Mail overseas!  This does cost more, but it comes with tracking, and will help ensure the item reaches you in a safe and timely manner!